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Letting the encoding engine work with constant bitrate disables all fine-tuned smart algorithms that are used to allocate bits. You're wasting bits in the stream filled with zero information.
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Well that's not correct. Even CBR files work a bit like VBR by using the
bit reservoir. The spare bits won't be filled up with zeros.
Encoding with 320cbr (preset-insane) also changes other settings, not only the bitrate. But the extra quality is probably not perceivable and therefore wasted.
Some of the guys "with golden ears" over at hydrogen audio can distinguish subtle artifacts on test samples with V2 that need V0 or even 320cbr to sound absolutly transparent.
There's also this nice chart, visualizing the quality gain (notice the jump in filesize from -V0 to 320cbr):
I myself use -V0 for classical music, soundtracks and the like. Just to have some headroom, to make sure the sound is flawless. The filesize increase is realy minor compared to 320cbr or lossless.
Jam it back in, in the dark.
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